After an unpleasant incident, the unnamed high-school student protagonist finds himself unable to make friends with most of his classmates. To escape the bustle of lunch time, he goes to the school rooftop. However, one day he finds there a girl who tells him a meteorite is about to hit Earth and wipe humanity, and that she wants to commit suicide before that happens.

After an unpleasant incident, the unnamed high-school student protagonist finds himself unable to make friends with most of his classmates. To escape the bustle of lunch time, he goes to the school rooftop. However, one day he finds there a girl who tells him a meteorite is about to hit Earth and wipe humanity, and that she wants to commit suicide before that happens.